Automatic valve grinder



Jan. l, 1924 v 1,479,467 R. H. HAZELTINE AUTOMATIC VALVE GRINDER Filed NOV. ll 1920 .3 Sheets-Sheet-l Jan. l, 1924 R. H. HAZELTINE AUTOMATIC VALVE GRINDER File'd Nov. 11, 1920 3 Sheets-'Sheet 2 Jan. 1, 1924 l 1,479,467

R. H. HAZELTINE j n AUTOMATIC VALVE GRI-NBER Filed Nov. 1l. 1920 3 Sheets-Sheet 3 'Sil Patented Jan. l, i924.

unirse stares ROBERT H. HAZELTINE, or BORDEAUX, manon, nssrenon To SPEOIALTYMAOHINE.:

COMPANY, OF NEW YORK, N. Y., .A CORPORATION F NEW YORK.

PATENT orrfflfcli.Ik

AUTOMATIC VALVE ennvnnn.

-Appiiea'wn inea November 11, 192e. serial No. 423,2vs.

To all whom t may concern:

Beit known that I, ROBERT H, HAZELTINE, a citizen of the United States, residino in Bordeaux, France, have invented an 2Dlmprovement in Automatic Valve Grinders, of which the following is a specification.

This invention relates to an apparatus for grinding valves in internal combustion engines and has for its object the provision of an automatic apparatus that will enable a skilled or an unskilled person to grind a valve to obtain a perfect t.

A selected embodiment of the invention is shown in the accompanying drawings, wherein- Y Y Figure 1 is a sectional view rof an automatic valve grinding apparatus; n

Figure 2 is a view in elevation of thisapparatus; Y

Figures 3 to 8 inclusive'are diagrammatic views of certain parts of the apparatus in various positions, illustrating the operation of the apparatus; and d Figures 9 and 10 are views of a modified form of a positioningfoot. y

The `embodiment of the invention herein shown' illustratesan apparatus adjustably positioned on an internal combustion engine aboveone of the valves and operatively attached to the valve., `The operation4 of this apparatus is substantially automatic and performs the function of oscillating the valve during grinding, and at intervals moves it to a new position on its seat where it is again oscillated. .Thiscycle of operation is continued 'until the valve has been properly ground to fit the seat. An independent adjustable means for pressing the valve against the seat during grinding is provided within the apparatus and is independent of pressure exerted in holding the apparatus in position on the engine.

Referring to the drawings, the apparatus preferably comprises a frame 1 which is properly positioned over an internal combustion engine 2 by means of adjusting a positioning foot 3 which permits the frame to be raised or lowered in order that a main shaft 4 carried by the frame and contacting with head 5 of the valve may be properly positioned to eXert a pressure on the valve. This pressure is obtained in a suitable manner, as by compressing spring 6 held between collar 7 mounted on the shaft, and a washer 8 held in the frame. It will be apparent by sure on the valve. When the apparatus is Y to be employed for grinding valves in a T" or- L-shaped motor head, a positioning foot 10 illustrated in igsl 9 and 10 is substituted for foot3. The main shaft 41s attached to the 4valve by any suitable means,V as V byal .screw threaded projection 11, received'in' a screw threaded recess in the topA of the valve, and a reinforcing means,psucha`s :collar 12 carriedV by the shaft, is ad'aptedto be moved against the upper surfacel of the rvalve.

Should the valve head be provided with Vholes or slots instead of the screw threaded recesses, any suitable attachments mayv be held on the projection V11 for engaging such openings.

The oscillating motion given tothe.-

valve by meansy of a crosshea'dv13 operated by a suitable. handle 14';` the crosshead carrying a rack 15 on its lower end for engagement with a gear lwhich preferably sur- ,roundsV the main shaft 4. Y* The power .is transmitted from they gear tothe shaftv by suitable means such as keys `17' .mountedon the main shaft andheld in slots 18 formed in the gear. The oscillation'of the valve is preferably equal in each direction.

The valve is rotated or repositioned on its seat at definite intervals by an upward and downwardVl movement of the. main shaft which. allows the'. keys .17 to be placed yin different slots in the gearV 16. lWhen the shaft is raised, no rotary power isv transmitted thereto as the keys are free of the slots, and as the gear 16 continues to oscillate other slots will ralign with the keys.- A suitable means for providing the vertical movement of shaft 4 is illustrated in the form of a cam 19 carried on, or integral with, a gear wheel 2O driven by pinion 21 which in turn is operated through a counter-shaft by the handle 14. This cam preferably operates in contact with a roller 22 carried by collar 23 mounted on the main shaft and raises the main shaft and consequently the valve. Rotary movement of collar 23 is prevented by its engagement with arm 24 which is firmly held on the frame of the apparatus.

In the operation of the apparatus which is carried on without requiring specialV at,- tention of the operator,- the manner of oscil lating the main shaft is readily understood by reference to Figs. l and 2 andfrom the foregoing description. The method of repositioning the valve on its seat Will be more fully appreciated by reference to Figs. 3 to v8 inclusive Where diagrammatic representations of the main shaft, keys, and cam are illustrated in different positions of travel. Referring to Figs. 3 and 4, thestart of the 11p-Ward movement ofthe shaft is illustrated, and in Figs. 5 and 6, the keys are Shown as out of contact with the gear 16, and the roller 22 is onl the high point of the cam; and, again, in Figs. 7V and Y8, the shaft is shown as dropping as roller 22 moves down the back of the'cam 19 and the keys then engage other slots in the gear.

The position of the cam, the size thereof, and the ratio of the circumferential diameters of the gear 20, and the pinion 21 may be varied so that the main shaft, `and consequently the valve, are capable of being raised and repositioned at different intervals. This invention may be variously embodied and the" particular form of the invention shown vmay be varied Within ythe scope of thesubjoined claims; I claim: i

l. A valve grinder Icomprising .a frame to be held against a motor, la main shaft held in said frame and adapted to be Vattached to Y a valve, a power operated counter-shaft in 'v'dependent of pressure .for holding said frame on the motor, a crosshead moving in guides and connected .to/said 'shaft through a rack and gear for oscillating said main shaft, and means for automatically moving said valve to different positions on its seat at`v predetermined intervals.

8. A valve grinder comprising a frame toY be heldA against a motor, a shaft carried thereby for positively engaging a valve, a gear associated with" said shaft, a crosshead operating in said frame foroscillating said gear, a counter-shaft and crank for transmitting power tdsaidl crosshead, a' second valve and Ybeing provided With ,extending v keys, -a springassociated With said rframe and With said shaft to force said valve Von to its seat, a gear surrounding said shaft andl-'having'slots therein fori holding said keys, a crosshead slidable in said kframe and having a rackl forengaging saidrgearrto give an oscillating movement thereto, a

manually operated countershaft carrying a crank for engaging said crossh'ead, second gear having a cam surface `and rotated by a pinion on said counter-shaft, and a roller affixed to said main shaft for engaging said second gear and adapted to be raisedbyA said cam to raise said main shaft.

. In testimony whereof, I have signed my name to this specification this 20th day of October, 1920.'

ROBERT HAZELHNE- ,i I 

